package server;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import server.clazzload.LagouClassLoader;
import server.entity.WebAppConfig;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.*;

/**
 * Minicat的主类
 */
public class Bootstrap {

    /**
     * 定义socket监听的端口号
     */
    private int port = 8080;

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    private List<WebAppConfig> webAppConfigs = new ArrayList<>();

    private Map<String, HttpServlet> servletMap = new HashMap<String, HttpServlet>();


    public void start() throws Exception{
        //加载server配置文件
        loadServer();
        int corePoolSize = 10;
        int maximumPoolSize = 50;
        long keepAliveTime = 100L;
        TimeUnit unit = TimeUnit.SECONDS;
        BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(50);
        ThreadFactory threadFactory = Executors.defaultThreadFactory();
        RejectedExecutionHandler handler = new ThreadPoolExecutor.AbortPolicy();
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
                corePoolSize,
                maximumPoolSize,
                keepAliveTime,
                unit,
                workQueue,
                threadFactory,
                handler
        );
        for (WebAppConfig webAppConfig : webAppConfigs) {
            final String hostName = webAppConfig.getHostName();
            final String port = webAppConfig.getPort();
            final String webLocation = webAppConfig.getWebLocation();
             String absolutePath ="";
            //读取文件
            File file=new File(webLocation);
            if (file.exists()){
                final File[] files = file.listFiles();
                for (File temFile : files) {
                    final File[] filesOne = temFile.listFiles();

                    if (null!=filesOne){
                        final String name1 = temFile.getName();
                        for (File fileOne : filesOne) {
                            final String name = fileOne.getName();
                            absolutePath = fileOne.getParent();
                            if (name.equals("web.xml")){
                                InputStream is = new FileInputStream(fileOne.getAbsolutePath());
                                    loadServlet(is,absolutePath,port,name1);
                                }

                        }
                    }

                }
            }
            // 定义一个线程池
            String finalAbsolutePath = webLocation;
            new Thread(new Runnable() {
                @Override
                public void run() {
                    ServerSocket serverSocket = null;
                    try {
                        serverSocket = new ServerSocket(Integer.valueOf(port));
                    } catch (IOException e) {
                    }
                    while (true) {
                        Socket socket = null;
                        try {
                            socket = serverSocket.accept();
                            RequestProcessor requestProcessor = new RequestProcessor(socket, servletMap, finalAbsolutePath,port);
                            //requestProcessor.start();
                            threadPoolExecutor.execute(requestProcessor);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }).start();

            System.out.println("init one test:"+port);
        }

    }

    /**
     * Minicat启动需要初始化展开的一些操作
     */
   /* public void start() throws Exception {
        loadServer();

        // 加载解析相关的配置，web.xml
        loadServlet();


        // 定义一个线程池
        int corePoolSize = 10;
        int maximumPoolSize = 50;
        long keepAliveTime = 100L;
        TimeUnit unit = TimeUnit.SECONDS;
        BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(50);
        ThreadFactory threadFactory = Executors.defaultThreadFactory();
        RejectedExecutionHandler handler = new ThreadPoolExecutor.AbortPolicy();


        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
                corePoolSize,
                maximumPoolSize,
                keepAliveTime,
                unit,
                workQueue,
                threadFactory,
                handler
        );





        *//*
            完成Minicat 1.0版本
            需求：浏览器请求http://localhost:8080,返回一个固定的字符串到页面"Hello Minicat!"
         *//*
        ServerSocket serverSocket = new ServerSocket(port);
        System.out.println("=====>>>Minicat start on port：" + port);

        *//*while(true) {
            Socket socket = serverSocket.accept();
            // 有了socket，接收到请求，获取输出流
            OutputStream outputStream = socket.getOutputStream();
            String data = "Hello Minicat!";
            String responseText = HttpProtocolUtil.getHttpHeader200(data.getBytes().length) + data;
            outputStream.write(responseText.getBytes());
            socket.close();
        }*//*


        *//**
         * 完成Minicat 2.0版本
         * 需求：封装Request和Response对象，返回html静态资源文件
         *//*
        *//*while(true) {
            Socket socket = serverSocket.accept();
            InputStream inputStream = socket.getInputStream();

            // 封装Request对象和Response对象
            Request request = new Request(inputStream);
            Response response = new Response(socket.getOutputStream());

            response.outputHtml(request.getUrl());
            socket.close();

        }*//*


        *//**
         * 完成Minicat 3.0版本
         * 需求：可以请求动态资源（Servlet）
         *//*
        *//*while(true) {
            Socket socket = serverSocket.accept();
            InputStream inputStream = socket.getInputStream();

            // 封装Request对象和Response对象
            Request request = new Request(inputStream);
            Response response = new Response(socket.getOutputStream());

            // 静态资源处理
            if(servletMap.get(request.getUrl()) == null) {
                response.outputHtml(request.getUrl());
            }else{
                // 动态资源servlet请求
                HttpServlet httpServlet = servletMap.get(request.getUrl());
                httpServlet.service(request,response);
            }

            socket.close();

        }
*//*

        *//*
            多线程改造（不使用线程池）
         *//*
        *//*while(true) {
            Socket socket = serverSocket.accept();
            RequestProcessor requestProcessor = new RequestProcessor(socket,servletMap);
            requestProcessor.start();
        }*//*


        System.out.println("=========>>>>>>使用线程池进行多线程改造");
        *//*
            多线程改造（使用线程池）
         *//*
        while (true) {

            Socket socket = serverSocket.accept();
            RequestProcessor requestProcessor = new RequestProcessor(socket, servletMap);
            //requestProcessor.start();
            threadPoolExecutor.execute(requestProcessor);
        }


    }
*/


    /**
     * 加载解析web.xml，初始化Servlet
     */
    private void loadServlet(InputStream resourceAsStream,String path,String port,String name) {
        SAXReader saxReader = new SAXReader();

        try {
            Document document = saxReader.read(resourceAsStream);
            Element rootElement = document.getRootElement();

            List<Element> selectNodes = rootElement.selectNodes("//servlet");
            for (int i = 0; i < selectNodes.size(); i++) {
                Element element = selectNodes.get(i);
                // <servlet-name>lagou</servlet-name>
                Element servletnameElement = (Element) element.selectSingleNode("servlet-name");
                String servletName = servletnameElement.getStringValue();
                // <servlet-class>server.LagouServlet</servlet-class>
                Element servletclassElement = (Element) element.selectSingleNode("servlet-class");
                String servletClass = servletclassElement.getStringValue();
               String classPath= path+"/"+servletClass;
                //加载进入内存
                LagouClassLoader edClassLoader = new LagouClassLoader();
                edClassLoader.findClass(classPath);
                // 根据servlet-name的值找到url-pattern
                Element servletMapping = (Element) rootElement.selectSingleNode("/web-app/servlet-mapping[servlet-name='" + servletName + "']");
                // /lagou
                String urlPattern = servletMapping.selectSingleNode("url-pattern").getStringValue();
                urlPattern=port+"/"+name+urlPattern;
                servletMap.put(urlPattern, (HttpServlet) Class.forName(servletClass).newInstance());
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    /**
     * <Server >
     * <Serverce>
     * <Connector port="8080"/>
     *
     * <Engine>
     * <Host name="localhost" appBase="Users/zhangshuhan/webapps"></Host>
     * </Engine>
     * </Serverce>
     * </Server>
     */
    private void loadServer() {
        InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("server.xml");
        SAXReader saxReader = new SAXReader();
        Document document = null;
        try {
            document = saxReader.read(resourceAsStream);
            Element rootElement = document.getRootElement();
            List<Element> selectNodes = rootElement.selectNodes("//Serverce");
            for (int i = 0; i < selectNodes.size(); i++) {
                Element element = selectNodes.get(i);
                Element connectorElement = (Element) element.selectSingleNode("Connector");
                String servletPort = connectorElement.attributeValue("port");
                Element engineElement = (Element) element.selectSingleNode("Engine");
                Element hostElement = (Element) engineElement.selectSingleNode("Host");
                String hostName = hostElement.attributeValue("name");
                String appBase = hostElement.attributeValue("appBase");
                WebAppConfig webAppConfig = new WebAppConfig();
                webAppConfig.setPort(servletPort);
                webAppConfig.setHostName(hostName);
                webAppConfig.setWebLocation(appBase);
                webAppConfigs.add(webAppConfig);
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        }

    }


    /**
     * Minicat 的程序启动入口
     *
     * @param args
     */
    public static void main(String[] args) {
        Bootstrap bootstrap = new Bootstrap();
        try {
            // 启动Minicat
            bootstrap.start();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
